From: Jaakko Jarvi (jajarvi_at_[hidden])
Date: 2002-10-08 15:39:41
Posted on behalf of Ellis Cohen.
/Jaakko
--------------
I'm getting an unexpected diagnostic message when using the
Boost preprocessor library. The compiler environment is the
HP-UX C++ compiler (aCC, version "HP ANSI C++ B3910B A.03.34").
The generated output -- see the last line of "Compiler output",
below -- *is* correct. I'm using Boost_1_28_0.
Can someone please help me answer whether
. my use of the preprocessor library is incorrect
. there a bug in aCC
. there is a problem in the preprocessor library?
Thank you.
Ellis Cohen
========================================================================
Example code fragment triggering the diagnostic:
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/comma_if.hpp>
#include <boost/preprocessor/repeat.hpp>
#include <boost/preprocessor/tuple/elem.hpp>
#define FOO0 (0, double, some_value)
#define FOO1 (0, double, some_other_value)
#define FOO2 (0, double, some_other_other_value)
#define FOO_CNT 3
#define PPV(I) FOO##I
#define PPV_FLAG(I) BOOST_PP_TUPLE_ELEM(3,0,PPV(I))
#define PPV_TYPE(I) BOOST_PP_TUPLE_ELEM(3,1,PPV(I))
#define PPV_NAME(I) BOOST_PP_TUPLE_ELEM(3,2,PPV(I))
#define BOOST_PP_DEF(I,_) BOOST_PP_COMMA_IF(I) BOOST_PP_CAT(d_,PPV_NAME(I))(BOOST_PP_CAT(other.d_,PPV_NAME(I)))
BOOST_PP_REPEAT(FOO_CNT, BOOST_PP_DEF, _)
#undef BOOST_PP_DEF
========================================================================
Compiler command:
/opt/aCC/bin/aCC \
-Iboost_includes \
-Wc,-ansi_for_scope,on \
-Aa \
+inst_compiletime +inst_v \
-E -c Isrc/boost_bug.C -o boost_bug.o
========================================================================
Compiler output:
Warning (anachronism) 823: "Isrc/boost_bug.C", line 18 # Redundant preprocessing concatenation operation results in two
valid preprocessing tokens. Depending on this implementation defined behavior will result in non-portable code.
BOOST_PP_REPEAT(FOO_CNT, BOOST_PP_DEF, _)
^^^^^^^^^^^^^^^
Warning (anachronism) 823: "Isrc/boost_bug.C", line 18 # Redundant preprocessing concatenation operation results in two
valid preprocessing tokens. Depending on this implementation defined behavior will result in non-portable code.
BOOST_PP_REPEAT(FOO_CNT, BOOST_PP_DEF, _)
^^^^^^^^^^^^^^^
Warning (anachronism) 823: "Isrc/boost_bug.C", line 18 # Redundant preprocessing concatenation operation results in two
valid preprocessing tokens. Depending on this implementation defined behavior will result in non-portable code.
BOOST_PP_REPEAT(FOO_CNT, BOOST_PP_DEF, _)
^^^^^^^^^^^^^^^
#line 1 "Isrc/boost_bug.C"
#line 1 "boost_includes/boost/preprocessor/cat.hpp"
#line 2 "Isrc/boost_bug.C"
#line 1 "boost_includes/boost/preprocessor/comma_if.hpp"
#line 1 "boost_includes/boost/preprocessor/comma.hpp"
#line 17 "boost_includes/boost/preprocessor/comma_if.hpp"
#line 1 "boost_includes/boost/preprocessor/empty.hpp"
#line 18 "boost_includes/boost/preprocessor/comma_if.hpp"
#line 1 "boost_includes/boost/preprocessor/if.hpp"
#line 1 "boost_includes/boost/preprocessor/logical/bool.hpp"
#line 17 "boost_includes/boost/preprocessor/if.hpp"
#line 1 "boost_includes/boost/preprocessor/tuple/elem.hpp"
#line 18 "boost_includes/boost/preprocessor/if.hpp"
#line 19 "boost_includes/boost/preprocessor/comma_if.hpp"
#line 3 "Isrc/boost_bug.C"
#line 1 "boost_includes/boost/preprocessor/repeat.hpp"
#line 4 "Isrc/boost_bug.C"
#line 18
d_some_value( other.d_some_value) , d_some_other_value( other.d_some_other_value) , d_some_other_other_value( other.d_some_other_other_value)